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I remember when Arborplex first came out. Back in the early 80's. Correct me if I'm wrong there, But it was cheap, and up to standard in strength requirements. Though Arborplex is seriously springy line. Slack, loading, working, Arborplex is notorious for knots slacking, slipping and.... You have to really set the knot with that stuff.
The more supple ropes today don't have the springy tendency of arborplex and for it hold their knots far better.
The bowline is a superior knot that is quick and easy to tie. With the proper attention paid when setting the bowline it is a very safe termination knot.
However, no knot is idiot proof.
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My sentiments entirely Gerry; a stiffer braided line will quite easily work loose a knot.
It never ceases to amaze me how the blind dogma of some makes them believe that one size fits all for safety. There are many contributing factors to all tree work systems that help ensure safety.
Often it is trading one risk for a lesser evil, but a risk still remains, such is the nature of the multitude of complex tasks in our work.
Having been involved with writing national standards for training and assessing of skills for short courses, I appreciate that beyond basic skills at an introductory level, the scope is too wide - only a time served apprenticeship with time served masters will reveal the required knowledge. I still seek these people out. Gerry is one of them.
I no longer contribute to the national standards. They aren't working. Too much "my idea is the one that MUST be adopted".
We can still seek out the time served, philosophical, intuitive masters, if accepting the risks and choosing to undertake our own apprenticeship.
Never assume a mountaineer or anyone knows best -they often don't. Listen, look, learn. Think why? and What if? We are the masters of your own undertaking. We are the ones who may die by our own hands, or lack of risk assessment. Please just consider that the next time captain authority puts on his leotard and gets in your face - they haven't always thought things through properly.